set back pump

[IndianaTahiti]

Well I am looking for inpuit.I will be painting and filling small flaws in the hull this winter and I am thinking about setting the pump further back.Right now the hand hole cover is well inside the transom.This is a heavy boat(19 foot tahiti bubble tiger, jc pump).I think this style of boat would benifit from this.It looks like I could just move the intake back on the holes and fill in the hole that is left.I am going to change the pump to a legends or dominator. Give me your inpuit:)

[IMPATIENT 1]

its the big hole left up frt when you move a stock intake back that's the problem;) think about a different intake 1st

[BrendellaJet]

just curious, why get rid of the JC?

[IMPATIENT 1]

just curious, why get rid of the JC?
i was thinking the same. maybe try some droops, snoot, or something before trying a set-back. i've reset intakes before and that alone is tough for beginers, doin a set-back would be trouble for a newbie, i wouldn't even attempt to do a set-back myself.to many angles and stuff to get rite, leave it too someone who has done it alot;) plus a set-back will need to be reset every once in awhile to reseal.

[BrendellaJet]

Well, I would do the setback. Its not a difficult job as long as you plan and research how its done and take your time. As long as you dont break through the transom the setback wont leak any more than the current set does. My setback leaks like a biatch, but I pulled the intake and am going to brace it when I reset it so that the intake gets some support from the transom.

[IndianaTahiti]

its the big hole left up frt when you move a stock intake back that's the problem;) think about a different intake 1st
The only intakes that I have seen have been for all out racing applications.:confused:

[IndianaTahiti]

just curious, why get rid of the JC?
Allmost every one on here seems to either change to a split bowl or a totally different pump all together:idea: My pump is useable just tired,I have seen used bowls on ebay but they usually go kind of high.I added up how much it would be to pc. together with a place diverter(then rebuilt) and was very close to a new set up(2 to 2.5 g)I would always prefer new over old when the prices are comparable.

[BrendellaJet]

Not sure what you mean by "Race" intake. If you are going to do a setback you should definitely have a shoe & ride plate installed. Its worth it in terms of performance and tunability.
There is a solution to the "hole" left over when you setback a pump. you can:
A) Fiberglass the hole using the piece that was cut out to allow the setback.
or
B) Use a piece of aluminum and bolt it to the intake and set that piece when you set the intake. Then epoxy the cutout piece below the aluminum and glass it in from the bottom. I used this method and it works. no leaks at all. here is a pick to help you understand:
http://www.***boat.com/image_center/data/520/212Boat_81310.jpg

[IndianaTahiti]

Well, I would do the setback. Its not a difficult job as long as you plan and research how its done and take your time. As long as you dont break through the transom the setback wont leak any more than the current set does. My setback leaks like a biatch, but I pulled the intake and am going to brace it when I reset it so that the intake gets some support from the transom.
It would seem to me That all the angles are going to be the same if I just move back and use the same holes.The motor sets about 24 inches in front of the transom,just thought I could move it back 6 to 8 inches to get more weight in the ass end.The bow on this boat is not as long as the super bubble tigers, so the placement of the passengers is a little more towards the front of the boat which makes it ride very wet. Do you have transom plates that you made?:idea:

[SB]

This is lot of work, what are your goals?
Give us your hp, speed, rpm, etc., now.
If you want more holeshot, a pump rebuild with a new impeller would be the ticket.
If you want more speed, some engine mods like better heads, might be more bang for the buck.

[BrendellaJet]

It would seem to me That all the angles are going to be the same if I just move back and use the same holes.The motor sets about 24 inches in front of the transom,just thought I could move it back 6 to 8 inches to get more weight in the ass end.The bow on this boat is not as long as the super bubble tigers, so the placement of the passengers is a little more towards the front of the boat which makes it ride very wet. Do you have transom plates that you made?:idea:
First off, take note of what SB said. If after reading that you decide you want to do the setback then go for it.
I wouldn't trust the angles that the pump is currently set. If it was done wrong then obviously you dont want to copy that. You can move the engine back, but keep in mind that could cause some ill handling. I would experiment with motor placement(a rail kit makes this easy)
I would research for boats like yours that people have done setbacks too, but generally speaking, Id set the back of the shoe even with the keel and set the front of the intake in a place that would allow a smooth transition from the keel to the pump. This is where the water flows and can have a big impact on performance if done right or wrong. If the boat rides good now(or before you took it apart) you can make a note of the intakes angle now and compare with how it sets when you are getting ready to epoxy it back in...
There is lots of info on this site about the process that is pretty detailed, definitely read it.
Yes, I made my plates. Getting ready to make another set to for my new to me boat. The hand hole is outside on the new boat so it should be a lot easier. On the boat in the pic, the pump was half outside half inside so there were a lot more contours to contend with.

[IndianaTahiti]

[QUOTE=BrendellaJet;2723403]Not sure what you mean by "Race" intake. If you are going to do a setback you should definitely have a shoe & ride plate installed. Its worth it in terms of performance and tunability.
There is a solution to the "hole" left over when you setback a pump. you can:
A) Fiberglass the hole using the piece that was cut out to allow the setback.
or
B) Use a piece of aluminum and bolt it to the intake and set that piece when you set the intake. Then epoxy the cutout piece below the aluminum and glass it in from the bottom. I used this method and it works. no leaks at all. here is a pick to help you understand:
Let me say that is ahttp://www.***boat.com/image_center/data/520/212Boat_81310.jpg[/QUOTE bad ass hull you have there! What I mean by race intakes is I have seen some other than the berkleys and they said for race applications only. Alot of the boat I have seen on this site have the hand hole cover on the outside of the transom,which makes it look like there is 3 foot of pump sticking out.My stock set up does not have a diverter so it looks like about half,I know a diverter will help just thought that while I have it all apart it wouldnt hurt to do this to it.I am going to have to reset the intake anyway cause some oil lifted some of the sealer.
]

[IndianaTahiti]

This is lot of work, what are your goals?
Give us your hp, speed, rpm, etc., now.
If you want more holeshot, a pump rebuild with a new impeller would be the ticket.
If you want more speed, some engine mods like better heads, might be more bang for the buck.
My goals are this,a little more lift,more room in front of the pulleys(1/2 inch now)to make it easier to pull engine,right now I have to take apart the drive shaft to get it out.This limits me to a non blower application:mad: I have about 500 hp turnin an a impeller 5400,dont know what kind of speed probablly in the low 60s. To me when I look at it at the beach it looks like the motor should be further back than it is.This thing wide open runs very flat I just thought this would help.I have two 16 gallon tanks,when they are full it looks right and rides with the nose up a little better but after they are half full it goes back flat. I know that I need a Diverter I just thought it would not be a big deal to do this while it is apart.I am not afraid to get my hands dirty I do all my own work less machining:D